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. 1988 Sep;27(2):147–153. doi: 10.1007/BF00200020

Suppressor cells in the effector phase of autologous cytotoxic reactions in cancer patients

Masao Eura 1,✉, Tatsuhiko Maehara 1, Tsutomu Ikawa 1, Takeru Ishikawa 1
PMCID: PMC11038131  PMID: 2970891

Abstract

Cytotoxicity was induced in lymphocytes (CL) from 10 out of 15 patients by autologous mixed lymphocyte tumor cell culture and further cultivation with recombinant interleukin-2. In cells from 3 of the 10 patients, cytotoxicity was suppressed by more than 50% when autologous peripheral blood mononuclear cells (PBMC) from the patients with large tumors were added to the autologous killing system. The cells responsible for suppressing the cytotoxicity in the effector phase were adherent or nonadherent to plastic depending on the patient examined. The T cell fraction from 1 patient significantly suppressed the cytotoxic activity, and this suppression was seen only in the autologous system. On the other hand, plastic adherent cells but not T cells from PBMC of 2 subjects suppressed the cytotoxic activity of CL. The reason why the main cell population suppressing the CL activity differed among the patients is unclear. However, the findings that the suppression was mostly abrogated following resection of the tumor mass suggested that suppressor cells, either of macrophage lineage or T cells, are induced in patients with a large tumor mass. This speculation is supported by the finding that the PBMC from a patient with tumor recurrence regained the suppressive activity.

Keywords: Peripheral Blood Mononuclear Cell, Cytotoxic Activity, Large Tumor, Tumor Mass, Suppressor Cell

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